Last Updated：2025/11/22

(geometry) Half of the major axis of a circle or ellipse. / (geometry) Half of the distances between the two branches of a hyperbola.

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semimajor axis

Source Word

semimajor axis

Noun

Japanese Meaning

円または楕円の場合、長軸の半分の長さ / 双曲線の場合、2つの分枝間の距離の半分

The semimajor axis of the ellipse is half the length of its major axis.

楕円の長半径は長軸の長さの半分です。

Sense（1）

(geometry) Half of the major axis of a circle or ellipse.

Sense（2）

(geometry) Half of the distances between the two branches of a hyperbola.

semimajor axes

（ plural ）